I'm wondering because I dyed my carpet using Dylon powder that you mix with hot water and spray on with a spray bottle. It worked great and my carpet looks a lot better. I was going to do the rear deck as well.

After I did about 3 coats on my carpet I let it dry and then installed it. I never hosed it down after it was dyed. If I rub the carpet I do get a bit of dye on my fingers but not much. The carpet does feel a little more coarse then before.